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US9466411B2 - Non-oriented electrical steel sheet - Google Patents

Non-oriented electrical steel sheet Download PDF

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US9466411B2
US9466411B2 US14/345,086 US201214345086A US9466411B2 US 9466411 B2 US9466411 B2 US 9466411B2 US 201214345086 A US201214345086 A US 201214345086A US 9466411 B2 US9466411 B2 US 9466411B2
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steel sheet
iron loss
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US20140345751A1 (en
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Yoshihiko Oda
Hiroaki Toda
Tadashi Nakanishi
Yoshiaki Zaizen
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JFE Steel Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14775—Fe-Si based alloys in the form of sheets
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1272—Final recrystallisation annealing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/60—Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1222—Hot rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1233—Cold rolling
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1244—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest
    • C21D8/1261—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the heat treatment(s) being of interest following hot rolling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14766—Fe-Si based alloys
    • H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust

Definitions

  • This disclosure relates to a non-oriented electrical steel sheet that has excellent iron loss properties, particularly in a high magnetic field.
  • Motors for vehicles such as hybrid electric vehicles or electric vehicles require large torque during startup and hill-climbing.
  • Increasing motor size is effective in increasing motor torque.
  • there is a problem in doing this as it increases vehicle weight and results in reduced fuel efficiency.
  • such motors can be designed for use in a non-conventional, high magnetic flux density range, such as 1.9 to 2.0 T, during startup and hill-climbing.
  • an electrical steel sheet is punched into the shape of a core constituting a rotor of a motor so that it is used as the core material.
  • strain relief annealing may be performed at approximately 750° C. for 2 hours.
  • JP 3458682 B discloses a technique of improving grain growth properties during strain relief annealing and reducing iron loss by increasing the amount of Al to add.
  • FIG. 1 is a graph illustrating a relationship between the amount of Sb added and the iron loss.
  • FIG. 2 is a graph illustrating a relationship between the amount of Mo added and the iron loss.
  • each of the hot rolled sheets was subjected to resultant hot rolled sheet annealing in an atmosphere of 100% N 2 at 1000° C. for 30 seconds and, further to cold rolling to be finished to a sheet thickness of 0.35 mm, followed by finish annealing in an atmosphere of 10% H 2 and 90% N 2 at 1000° C. for 10 seconds and strain relief annealing at 750° C. for 2 hours in DX gas (H 2 : 4%, CO: 7%, CO 2 : 8%, N 2 : balance).
  • FIG. 1 illustrates the relationship between the amount of Sb added to the test specimens thus obtained and W 19/100 and W 15/100 values.
  • the reason why iron loss properties were evaluated under the conditions of 1.9 T and 100 Hz is because products are generally used at around these magnetic flux density and frequency levels during startup and hill-climbing when hybrid electric vehicles require large torque.
  • W 15/100 is evaluated is because W 15/100 is a conventional evaluation point. It can be seen from FIG. 1 that the Mo-added steel, in particular, shows a significant reduction in W 19/100 where Sb is 0.001% or more. On the other hand, while the Mo-added steel also shows a reduction in W 15/100 where Sb is 0.001% or more, the magnitude of reduction is relatively small as compared to W 19/100 .
  • each steel sheet was analyzed with SEM.
  • the results of the analysis are as follows: in each steel sample without Sb and Mo, a nitride layer and an oxide layer were observed on a surface layer of the steel sheet. In each steel sample with only Sb added, formation of a nitride layer was insignificant. Furthermore, in each steel sample with a combination of Sb with Mo added, formation of a nitride layer and formation of an oxide layer were both insignificant. The following assumptions are made regarding the cause of these nitride layers and oxide layers leading to a more significant increase in iron loss in a high magnetic field range.
  • the magnetic flux density is not high in a low magnetic field range around 1.5 T, it is possible to allow the passage of the magnetic flux sufficiently by allowing magnetization of only those crystal grains in the steel sheet in which domain wall displacement takes place easily.
  • magnetization to a high magnetic field range of 1.9 T requires magnetization of the entire steel sheet. Accordingly, it is necessary to magnetize even those crystal grains in which domain wall displacement is difficult to occur including those in a nitride layer and an oxide layer formed on a surface layer of the steel sheet. It is thus believed that iron loss increased because of a larger amount of energy required to magnetize such crystal grains in which domain wall displacement is difficult to achieve to a high magnetic field range.
  • FIG. 2 illustrates the relationship between the amount of Mo added to the test specimens thus obtained and W 19/100 and W 15/100 values. It can be seen from FIG. 2 that W 19/100 decreases where Mo content is 0.001% or more and increases where Mo content is 0.04% or more. On the other hand, W 15/100 showed no reduction in iron loss by addition of Mo, while it turned to increase where Mo content is 0.04% or more. To investigate the cause of a reduction in iron loss in a high magnetic field range where Mo content is 0.001% or more, the structure of each steel sheet was analyzed with SEM.
  • Mo content is not less than 0.001% and not more than 0.04%.
  • C content is 0.005% or less from the viewpoint of preventing magnetic aging. It is difficult to industrially control C content to 0% and, therefore, C is often contained in an amount of 0.0005% or more.
  • Si is an element useful to increase specific resistance of a steel sheet.
  • Si is preferably added in an amount of 1% or more.
  • Si content exceeding 5% results in a decrease in magnetic flux density and an associated decrease in saturation magnetic flux density.
  • the upper limit of Si content is 5%.
  • Al like Si, is an element also useful to increase specific resistance of a steel sheet.
  • Al is preferably added in an amount of 0.1% or more.
  • Al content exceeding 3% results in a decrease in magnetic flux density and an associated decrease in saturation magnetic flux density.
  • the upper limit of Al content is 3%.
  • Mn is an element useful to increase specific resistance of a steel sheet.
  • Mn is preferably added in an amount of 0.1% or more.
  • Mn content exceeding 5% results in a decrease in magnetic flux density.
  • the upper limit of Mn content is 5%.
  • S is an element that would cause an increase in iron loss due to precipitation of MnS if added in an amount exceeding 0.005%.
  • the upper limit of S content is 0.005%.
  • the lower limit of S content is preferably 0%, it is difficult to industrially control S content to 0%. Therefore, S is often contained in an amount of 0.0005% or more.
  • P is an element that would harden a steel sheet if added in an amount exceeding 0.2%.
  • P is preferably added in an amount not more than 0.2%, more preferably 0.1% or less. While the lower limit of P content is preferably 0%, it is difficult to industrially control P content to 0%. Therefore, P is often contained in an amount of 0.01% or more.
  • N is an element that would lead to precipitation of a larger amount of AlN and increased iron loss if contained in a large amount.
  • N content is 0.005% or less. While the lower limit of N content is preferably 0%, it is difficult to industrially control N content to 0%. Therefore, N is often contained in an amount of 0.001% or more.
  • Ti is an element that would lead to formation of Ti-based carbonitrides and increased iron loss if contained in an amount exceeding 0.0030%.
  • the upper limit of Ti content is 0.0030%.
  • the lower limit of Ti content is preferably 0%, it is difficult to industrially control Ti content to 0%. Therefore, Ti is often contained in an amount of 0.0005% or more.
  • Nb is an element that would lead to formation of Nb-based carbonitrides and increased iron loss if contained in an amount exceeding 0.0050%.
  • the upper limit of Nb content is 0.0050%.
  • the lower limit of Nb content is preferably 0%, it is difficult to industrially control Nb content to 0%. Therefore, Nb is often contained in an amount of 0.0001% or more.
  • V is an element that would lead to formation of V-based carbonitrides and increased iron loss if contained in an amount exceeding 0.0050%.
  • the upper limit of V content is 0.0050%.
  • the lower limit of V content is preferably 0%, it is difficult to industrially control V content to 0%. Therefore, V is often contained in an amount of 0.0005% or more.
  • Zr is an element that would enhance the nitride forming ability if incorporated. In that case, it is not possible to inhibit the nitridation of a surface layer of a steel sample in a sufficient manner even with addition of Sb, Sn and Mo. This results in an increase in iron loss in a high magnetic field range.
  • Zr content is 0.002% or less. While the lower limit of Zr content is preferably 0%, it is difficult to industrially control Zr content to 0%. Therefore, Zr is often contained in an amount of 0.0005% or more.
  • Sn like Sb, is an element that would prevent nitridation during finish annealing and reduce iron loss if added in an amount of 0.001% or more.
  • the lower limit of Sn content is 0.001%.
  • the upper limit of Sn content is 0.1%.
  • Ca is an element that precipitates as CaS to suppress precipitation of fine sulfides so that iron loss is reduced.
  • Ca is preferably added in an amount of 0.001% or more.
  • Ca content exceeding 0.01% leads to precipitation of a larger amount of CaS, which increases rather than reduces iron loss.
  • the upper limit of Ca is preferably 0.01%.
  • Mg is an element useful to reduce iron loss by controlling the spherical shape of inclusions.
  • Mg content is preferably added in an amount of 0.0005% or more.
  • the upper limit of Mg content is preferably 0.005%.
  • REM or rare earth element
  • REM is an element useful to reduce iron loss by coarsening sulfides.
  • REM is preferably added in an amount of 0.001% or more.
  • the upper limit of REM content is preferably 0.05%.
  • Cr is an element useful to reduce iron loss by increasing specific resistance.
  • Cr is preferably added in an amount of 0.4% or more.
  • Cr content exceeding 5% results in a decrease in magnetic flux density.
  • the upper limit of Cr content is preferably 5%.
  • reduce Cr content it is more preferable to either reduce Cr content to 0.05% or less, or add Cr in an amount of 0.4 to 5%. If Cr content is reduced to 0.05% or less, the lower limit of Cr content is preferably 0%. However, it is difficult to industrially control Cr content to 0% and, therefore, Cr is often contained in an amount of 0.005% or more.
  • Ni, Co and Cu may also be added. These elements are preferably added in the following range: Ni: 0.1 to 5%, Co: 0.1 to 5% and Cu: 0.05 to 2%.
  • Molten steel which was obtained by being blown in a converter, was subjected to degassing treatment and subsequent casting to produce steel slabs, each having a chemical composition as shown in Tables 1-1 and 1-2. Then, each of the steel slabs was subjected to slab heating at 1140° C. for 1 hour and then hot rolling to be finished to a sheet thickness of 2.0 mm. In this case, the hot rolling finishing temperature was 800° C. and each hot rolled sheet was coiled at 610° C. after finish rolling. Following coiling, each sheet was subjected to hot rolled sheet annealing in an atmosphere of 100% N 2 at 1000° C. for 30 seconds.
  • each sheet was subjected to cold rolling to be finished to a sheet thickness of 0.30 to 0.35 mm and finish annealing in an atmosphere of 10% H 2 and 90% N 2 under the conditions as shown in Tables 2-1 and 2-2. Then, each sheet was evaluated for its magnetic properties as finish annealed or after undergoing strain relief annealing subsequent to the finish annealing. For magnetometry, Epstein measurement was performed where an Epstein sample was cut out from each sheet in a rolling direction and a transverse direction (a direction perpendicular to the rolling direction).
  • Comparative Example indicated by ID 48 which has a sheet thickness different from those of the other examples indicated by IDs 1 to 47, the content of one or both of Sn and Sb as well as the content of Mo fall below our range. Therefore, the values of W 15/100 and W 19/100 are higher than those of Example indicated by ID 49 having the same sheet thickness.

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  • Chemical & Material Sciences (AREA)
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JP2011211553 2011-09-27
JP2011-211553 2011-09-27
PCT/JP2012/006141 WO2013046661A1 (fr) 2011-09-27 2012-09-26 Feuille d'acier magnétique non à grains orientés

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Cited By (3)

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US10704115B2 (en) 2014-10-30 2020-07-07 Jfe Steel Corporation Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
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US10704115B2 (en) 2014-10-30 2020-07-07 Jfe Steel Corporation Non-oriented electrical steel sheet and method for manufacturing non-oriented electrical steel sheet
US11286537B2 (en) 2017-01-17 2022-03-29 Jfe Steel Corporation Non-oriented electrical steel sheet and method of producing same
US11404189B2 (en) * 2017-05-31 2022-08-02 Jfe Steel Corporation Non-oriented electrical steel sheet and method for manufacturing the same

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